1# 2# kbuild file for usr/ - including initramfs image 3# 4 5klibcdirs:; 6PHONY += klibcdirs 7 8suffix_y = $(CONFIG_INITRAMFS_COMPRESSION) 9AFLAGS_initramfs_data.o += -DINITRAMFS_IMAGE="usr/initramfs_data.cpio$(suffix_y)" 10 11# Generate builtin.o based on initramfs_data.o 12obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o 13 14# initramfs_data.o contains the compressed initramfs_data.cpio image. 15# The image is included using .incbin, a dependency which is not 16# tracked automatically. 17$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio$(suffix_y) FORCE 18 19##### 20# Generate the initramfs cpio archive 21 22hostprogs-y := gen_init_cpio 23initramfs := $(CONFIG_SHELL) $(srctree)/scripts/gen_initramfs_list.sh 24ramfs-input := $(if $(filter-out "",$(CONFIG_INITRAMFS_SOURCE)), \ 25 $(shell echo $(CONFIG_INITRAMFS_SOURCE)),-d) 26ramfs-args := \ 27 $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \ 28 $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) 29 30# .initramfs_data.cpio.d is used to identify all files included 31# in initramfs and to detect if any files are added/removed. 32# Removed files are identified by directory timestamp being updated 33# The dependency list is generated by gen_initramfs.sh -l 34ifneq ($(wildcard $(obj)/.initramfs_data.cpio.d),) 35 include $(obj)/.initramfs_data.cpio.d 36endif 37 38quiet_cmd_initfs = GEN $@ 39 cmd_initfs = $(initramfs) -o $@ $(ramfs-args) $(ramfs-input) 40 41targets := initramfs_data.cpio.gz initramfs_data.cpio.bz2 \ 42 initramfs_data.cpio.lzma initramfs_data.cpio.xz \ 43 initramfs_data.cpio.lzo initramfs_data.cpio.lz4 \ 44 initramfs_data.cpio 45# do not try to update files included in initramfs 46$(deps_initramfs): ; 47 48$(deps_initramfs): klibcdirs 49# We rebuild initramfs_data.cpio if: 50# 1) Any included file is newer then initramfs_data.cpio 51# 2) There are changes in which files are included (added or deleted) 52# 3) If gen_init_cpio are newer than initramfs_data.cpio 53# 4) arguments to gen_initramfs.sh changes 54$(obj)/initramfs_data.cpio$(suffix_y): $(obj)/gen_init_cpio $(deps_initramfs) klibcdirs 55 $(Q)$(initramfs) -l $(ramfs-input) > $(obj)/.initramfs_data.cpio.d 56 $(call if_changed,initfs) 57